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Tytuł pozycji:

Polymeric membranes composed of polystyrenes tethering amino acids for preferential CO separation over H.

Tytuł :
Polymeric membranes composed of polystyrenes tethering amino acids for preferential CO separation over H.
Autorzy :
Taniguchi, Ikuo
Ootera, Yuka
Chowdhury, Firoz
Tomizaki, Kin-ya
Kai, Teruhiko
Kazama, Shingo
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Temat :
POLYSTYRENE
AMINO acids
TRIFLUOROACETIC acid
CARBON dioxide
HYDROXYL group
GAS separation membranes
SEPARATION of gases
Źródło :
Polymer Bulletin; Aug2012, Vol. 69 Issue 4, p405-415, 11p
Czasopismo naukowe
Various N- tert-butoxycarbonyl ( N-Boc) amino acids, such as glycine, valine, and serine, were combined to 4-chloromethylstyrene. The resulted monomers were readily polymerized to give polystyrenes tethering an amino acid by a conventional free radical polymerization technique. After deprotection of the N-Boc group with trifluoroacetic acid, the obtained polystyrene derivatives were soluble in ethanol and spin-coated on a commercial poly(ether sulfone) porous membrane to fabricate a composite membrane for CO separation over H. The CO selective layer of synthesized PSt was ca . 200 nm thick, and the composite membranes showed preferential CO separation over H, while parent polystyrene passed through H rather than CO. Especially, the separation factor $$ \alpha_{{{\text{CO}}_{ 2} /{\text{H}}_{ 2} }} $$ was raised after alkaline treatment to form free primary amine on the terminus of graft chain. Serine tethered polystyrene showed the highest $$ \alpha_{{{\text{CO}}_{ 2} /{\text{H}}_{ 2} }} $$ (16) among them, which suggested the hydroxyl group would enhance the CO affinity of primary amine. [ABSTRACT FROM AUTHOR]
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